Datasheet

Rev. 3.00, 03/04, page 9 of 830
1.3.3 Pin Functions
Table 1.2 Pin Functions
Type Symbol Pin No. I/O Name and Function
VCC 1, 36
86
Input Power supply pins. Connect all these pins to the
system power supply. Connect the bypass
capacitor between VCC and VSS (near VCC).
VCL 13 Input External capacitance pin for internal step-down
power. Connect this pin to Vss through an
external capacitor (that is located near this pin) to
stabilize internal step-down power.
Power
supply
VSS 7, 42,
95, 111
139
Input Ground pins. Connect all these pins to the system
power supply (0V).
XTAL 143 Input
EXTAL 144 Input
For connection to a crystal resonator. An external
clock can be supplied from the EXTAL pin. For an
example of crystal resonator connection, see
section 22, Clock Pulse Generator.
φ 18 Output Supplies the system clock to external devices.
EXCL 18 Input 32.768-kHz external clock for sub clock should be
supplied.
Clock
PFSEL 141 Input Pin for use by PLL. For an example of PLL
connection, see section 22, Clock Pulse
Generator.
Operating
mode
control
MD2
MD1
MD0
14
9
10
Input These pins set the operating mode. Inputs at
these pins should not be changed during
operation.
RES 8 Input Reset pin. When this pin is low, the chip is reset.
RESO 142 Output Outputs a reset signal to an external device.
STBY 12 Input When this pin is low, a transition is made to
hardware standby mode.
System
control
FWE 135 Input Pin for use by flash memory.
Address
bus
A23 to A16 33 to 35
37 to 41
Output Address output pins
A15 to A0 96 to 110
112
D15 to D8 128 to 121 Input/
Output
Upper bidirectional data bus Data bus
D7 to D0 85 to 78 Lower bidirectional data bus